Brandon Belt #9 of the San Francisco Giants is greeted after scoring a run in the sixth inning against the Chicago Cubs on September 02 2012 at Wrigley Field in Chicago, Illinois. (Photo by David Banks/Getty Images)

Brandon Belt #9 of the San Francisco Giants is greeted after scoring a run in the sixth inning against the Chicago Cubs on September 02 2012 at Wrigley Field in Chicago, Illinois. (Photo by David Banks/Getty

SAN FRANCISCO, CA - AUGUST 24: Brandon Belt #9 of the San Francisco Giants hits a double off the right centerfield wall in the fifth inning against the Atlanta Braves at AT&T Park on August 24, 2012 in San Francisco, California. (Photo by Thearon W. Henderson/Getty Images)

SAN FRANCISCO, CA - AUGUST 24: Brandon Belt #9 of the San Francisco Giants hits a double off the right centerfield wall in the fifth inning against the Atlanta Braves at AT&T Park on August 24, 2012 in San

CHICAGO -- - The Giants have gotten 10 home runs from their third basemen and eight from their first basemen. Those are power positions, but neither Pablo Sandoval (eight homers, none since July 8) nor Brandon Belt (all four homers in June) is muscling up.

Yet the Giants, last in the league with 81 homers, remain in first place.

"Really, pretty amazing," manager Bruce Bochysaid. "We're putting runs on the board without the power. Power really helps you, too, when you get behind."

Sandoval hasn't homered in 109 at-bats, and Bochy was asked if his fitness and weight are factors.

"It's an ongoing issue, obviously, something that he's been battling," said Bochy, adding that two stints on the disabled list have affected Sandoval. "He showed last year that he's a different player when his weight is down. ... I'd like to get him down a little bit. It's hard in September to have that in your focus. He needs to get back with the program he had two years ago."

Bochy sees Belt evolving into a power hitter.

"I think it's going to happen. He's strong. I think the adjustments he's made in the swing are going to help him on the power side," Bochy said.

Nady's number: No. 68 was temporary for Xavier Nady, who'll get No. 12 when the Giants begin a homestand Monday. Asked if he thought of riding out 68, considering he had two productive games wearing the number, he said, "Hopefully it's not the jersey."

After growing up in Salinas and playing at Cal, Nady is looking forward to his first Giants home game. He's a .299 hitter in 77 at-bats at China Basin.

"I grew up an hour and a half south of there," he said. "It's pretty neat just to come to the field and put on this uniform. It's a wonderful park. I always liked playing there."

The biggest issue, Nady said with a smile, is receiving an exorbitant number of ticket requests from relatives.

GIANTS ON DECK

Monday

vs. Diamondbacks

1:05 p.m. CSNBA

Corbin (5-6)

vs. Zito (10-8)

Tuesday

vs. Diamondbacks

7:15 p.m. CSNBA

Kennedy (12-11)

vs. Vogelsong (12-7)

Wednesday

vs. Diamondbacks

7:15 p.m. CSNBA

Cahill (9-11) vs. Bumgarner (14-9)

GIANTS LEADING OFF

Good and bad: Alfonso Soriano hit his 25th home run, the ninth time he's reached the quarter-century mark. On the flip side, Soriano misplayed Brandon Belt's sixth-inning flyball, which turned into a triple.

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